99553 has 4 divisors (see below), whose sum is σ = 100548. Its totient is φ = 98560.

The previous prime is 99551. The next prime is 99559. The reversal of 99553 is 35599.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 35599 = 97 ⋅367.

It can be written as a sum of positive squares in 2 ways, for example, as 7744 + 91809 = 88^2 + 303^2 .

It is a cyclic number.

It is not a de Polignac number, because 99553 - 2¹ = 99551 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (25137).

2⁹⁹⁵⁵³ is an apocalyptic number.

It is an amenable number.

99553 is a deficient number, since it is larger than the sum of its proper divisors (995).

99553 is a wasteful number, since it uses less digits than its factorization.

99553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994.

The product of its digits is 6075, while the sum is 31.

The square root of 99553 is about 315.5202053752. The cubic root of 99553 is about 46.3466253579.

The spelling of 99553 in words is "ninety-nine thousand, five hundred fifty-three".